7.2 - RHSA-2016:1051

Problem Description:

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64 Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

3. Description:

The kernel-rt packages contain the Linux kernel, the core of any Linux operating system.

The following packages have been upgraded to a newer upstream version: kernel-rt (3.10.0-327.18.2). This version provides a number of bug fixes and enhancements, including:

* [scsi] bnx2fc: Fix FCP RSP residual parsing and remove explicit logouts

* [scsi] mpt3sas: Fix for Asynchronous completion of timedout IO and task abort of timedout IO

* [scsi] scsi_error: should not get sense for timeout IO in scsi error handler

* [scsi] Revert libiscsi: Reduce locking contention in fast path

* [mm] madvise: fix MADV_WILLNEED on shmem swapouts

* [cpufreq] intel_pstate: decrease number of "HWP enabled" messages and enable HWP per CPU

* [kernel] sched: Robustify topology setup

* [kernel] sched/fair: Disable tg load_avg/runnable_avg update for root_task_group

* [kernel] sched/fair: Move hot load_avg/runnable_avg into separate cacheline

* [ib] mlx5: Fix RC transport send queue overhead computation

* [fs] nfsd: fix clp->cl_revoked list deletion causing softlock in nfsd

* [fs] ceph: multiple updates

(BZ#1322033)

Security Fix(es):

* A flaw was found in the way the Linux kernel's ASN.1 DER decoder processed certain certificate files with tags of indefinite length. A local, unprivileged user could use a specially crafted X.509 certificate DER file to crash the system or, potentially, escalate their privileges on the system. (CVE-2016-0758, Important)

Red Hat would like to thank Philip Pettersson of Samsung for reporting this issue.

Bug Fix(es):

* The hotplug lock and the console semaphore could be acquired in an incorrect order, which could previously lead to a deadlock causing the system console to freeze. The underlying code has been adjusted to acquire the locks in the correct order, resolving the bug with the console. (BZ#1324767)

4. Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1300257 - CVE-2016-0758 kernel: tags with indefinite length can corrupt pointers in asn1_find_indefinite_length() 1322033 - kernel-rt: update to the RHEL7.2.z batch#4 source tree